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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

I am facing one big problem at the time of installation "WINE- Software" in Ubantu 9.10 (Karmic Release), errors are like-

GPG error: http://ppa.launchpad.net karmic Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5A9A06AEF9CB8DB0

Wine is present in the standard Ubuntu repositories. Why did you add a ppa repository to your system? Or did you add a ppa repository for something else?
In any case, the error you are getting is likely because you need to add the GPG key for the ppa repository that you decided to add to your system.
To add a repository to your system, including the GPG key, see these articles which pretty much cover all the bases:https://help.ubuntu.com/9.10/add-app...ing-repos.htmlhttps://help.ubuntu.com/community/Repositories/Ubuntu
Or check out the simple way from Ubuntu-Geek, the founder of the Ubuntu forums:http://www.ubuntugeek.com/ubuntu-tip...in-karmic.html
Or you can just comment out (i.e., put a # in front of) or remove the ppa repository. Then when you either install the GPG key, or comment out, or remove the ppa repo, just run:

Code:

sudo apt-get update
sudo apt-get install wine

and you should be good to go.
Write back if you need more help. If you do need more help, then please post the output of:

Code:

cat /etc/apt/sources.list

and the contents of any files in the: /etc/apt/sources.list.d/ directory.